On Treves' Algebraic Characterization of the KdV Hierarchy
On Twistor Solutions of the dKP Equation
On weakly non-local, nilpotent, and super-recursion operators for N=1 super-equations
On Whitham theory for perturbed integrable equations
On Whitham's Averaging Method
One class of solutions with two invariant relations for the problem of motion of the Kowalevski top in double constant field
One invariant measure and different Poisson brackets for two nonholonomic systems
One method for constructing exact solutions of equations of two-dimensional hydrodynamics of an incompressible fluid
One-way coupled Van der Pol system
Open circular billiards and the Riemann hypothesis
Optical Fiber Communications:Group of the Nonlinear Transformations
Optical Solitons in an Anisotropic Medium with Arbitrary Dipole Moments
Optical solitons in higher order nonlinear Schrodinger equation
Ordinary differential equations which linearize on differentiation
Oriented Associativity Equations and Symmetry Consistent Conjugate Curvilinear Coordinate Nets
Orthonormal Polynomials on the Unit Circle and Spatially Discrete Painlevé II Equation
Overcoming Obstacles to Integrability I: Perturbed Diffusive Systems
Overcoming Obstacles to Integrability in Perturbed Nonlinear Evolution Equations